Computational micromechanics of the transverse and shear behavior of unidirectional fiber reinforced polymers including environmental effects

Naya, F.; González, C.; Lopes, C.S.; Veen, Sjoerd van der; Pons, François

doi:10.1016/j.compositesa.2016.06.018

Cited by 190 publications

(137 citation statements)

References 44 publications

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“…A study into the representative volume element size is conducted, and the framework is demonstrated by simulating the ageing process of a unidirectional specimen immersed in water. The influence of transient swelling stresses on microscopic failure is investigated, and failure envelopes of dry and saturated micromodels are compared.The combination of such effects makes a purely experimental characterisation of the hygrothermal ageing phenomenon a difficult task.A number of authors have therefore advocated numerical modelling in order to simulate the hygrothermal ageing process in polymers and composites [2,3,7,8] as well as in porous materials [9]. Because the mentioned degradation effects act on the microsopic material constituents, a micromechanics approach becomes a necessity.…”

mentioning

confidence: 99%

“…However, it is also important to predict how such microscopic processes affect macroscopic material behaviour. Naya et al [7] successfully used micromechanics to predict the wet properties of a unidirectional ply by fitting a mesoscale failure criterion, although the swelling phenomenon was not considered. Such a numerical homogenisation approach entails a one-way upscaling procedure after which the microscopically obtained failure envelope can be used in mesolevel analysis.However, macroscopic phenomena such as transient swelling stresses during diffusion [10] may also influence the resultant microscopic degradation processes.…”

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confidence: 99%

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A multiscale and multiphysics numerical framework for modelling of hygrothermal ageing in laminated composites

Rocha

Meer

Nijssen

et al. 2017

Int. J. Numer. Meth. Engng

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In this work, a numerical framework for modelling of hygrothermal ageing in laminated composites is proposed. The model consists of a macroscopic diffusion analysis based on Fick's second law coupled with a multiscale FE 2 stress analysis in order to take microscopic degradation mechanisms into account. Macroscopic material points are modelled with a representative volume element with random fibre distribution. The resin is modelled as elasto-plastic with damage, and cohesive elements are included at the fibre/matrix interfaces. The model formulations and the calibration of the epoxy model using experimental results are presented in detail. A study into the representative volume element size is conducted, and the framework is demonstrated by simulating the ageing process of a unidirectional specimen immersed in water. The influence of transient swelling stresses on microscopic failure is investigated, and failure envelopes of dry and saturated micromodels are compared.The combination of such effects makes a purely experimental characterisation of the hygrothermal ageing phenomenon a difficult task.A number of authors have therefore advocated numerical modelling in order to simulate the hygrothermal ageing process in polymers and composites [2,3,7,8] as well as in porous materials [9]. Because the mentioned degradation effects act on the microsopic material constituents, a micromechanics approach becomes a necessity. However, it is also important to predict how such microscopic processes affect macroscopic material behaviour. Naya et al. [7] successfully used micromechanics to predict the wet properties of a unidirectional ply by fitting a mesoscale failure criterion, although the swelling phenomenon was not considered. Such a numerical homogenisation approach entails a one-way upscaling procedure after which the microscopically obtained failure envelope can be used in mesolevel analysis.However, macroscopic phenomena such as transient swelling stresses during diffusion [10] may also influence the resultant microscopic degradation processes. Joliff et al.[3] simulated the immersion of a macroscopic specimen including diffusion and differential swelling by explicitly meshing its complete microstructure. The authors demonstrated the importance of including differential swelling in the ageing model, although material failure and degradation (plasticisation and interface weakening) were not included. However, such a DNS approach becomes computationally infeasible if an iterative failure analysis is performed at the same time.In order to simultaneously account for macroscopic transient phenomena and microscopic failure mechanisms, a concurrent multiscale approach can be chosen by solving finite element problems at both macroscale and microscale and coupling them through homogenisation by means of a so-called FE 2 approach [11]. A large body of literature is dedicated to the treatment of pure stress analysis in FE 2 [12,13], including consistent treatment of material failure across scales [14] and modelling of processes...

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confidence: 99%

mentioning

confidence: 99%

A multiscale and multiphysics numerical framework for modelling of hygrothermal ageing in laminated composites

Rocha

Meer

Nijssen

et al. 2017

Int. J. Numer. Meth. Engng

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“…It was assumed reasonably in the range of 2‐5 J/m 2 . Similar values were used by other authors and were reported in the literature . In addition, the interface fracture energies in the shear modes were set equal to the matrix cracking fracture energy, G IIc = 100 J/m 2 , a value similar to the one used .…”

Section: Experimental and Modeling Proceduresmentioning

confidence: 99%

“…Similar values were used by other authors and were reported in the literature. [26][27][28] In addition, the interface fracture energies in the shear modes were set equal to the matrix cracking fracture energy, G IIc = 100 J/m 2 , a value similar to the one used. 26 A sensitivity study of these values indicates their effect on material behavior was only limited in the damage propagation regime.…”

Section: Micromechanical Modelmentioning

confidence: 99%

“…[26][27][28] In addition, the interface fracture energies in the shear modes were set equal to the matrix cracking fracture energy, G IIc = 100 J/m 2 , a value similar to the one used. 26 A sensitivity study of these values indicates their effect on material behavior was only limited in the damage propagation regime. 29 The RVE was discretized using wedge and brick finite elements for fibers and matrix with full Gauss integration (C3D6 and C3D8).…”

Section: Micromechanical Modelmentioning

confidence: 99%

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A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites

et al. 2018

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A novel methodology combining multiscale mechanical testing and finite element modeling is proposed to quantify the sintering temperature‐dependent mechanical properties of oxide matrix composites, like aluminosilicate (AS) fiber reinforced Al2O3 matrix (ASf/Al2O3) composite in this work. The results showed a high‐temperature sensitivity in the modulus/strength of AS fiber and Al2O3 matrix due to their phase transitions at 1200°C, as revealed by instrumented nanoindentation technique. The interfacial strength, as measured by a novel fiber push‐in technique, was also temperature‐dependent. Specially at 1200°C, an interfacial phase reaction was observed, which bonded the interface tightly, as a result, the interfacial shear strength was up to ≈450 MPa. Employing the measured micro‐mechanical parameters of the composite constituents enabled the prediction of deformation mechanism of the composite in microscale, which suggested a dominant role of interface on the ductile/brittle behavior of the composite in tension and shear. Accordingly, the ASf/Al2O3 composite exhibited a ductile‐to‐brittle transition as the sintering temperature increased from 800 to 1200°C, due to the prohibition of interfacial debonding at higher temperatures, in good agreement with numerical predictions. The proposed multiscale methodology provides a powerful tool to study the mechanical properties of oxide matrix composites qualitatively and quantitatively.

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Prediction of low‐velocity impact dent for composite laminates based on an anisotropic elastoplastic damage model

et al. 2021

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In this paper, a three-dimensional finite element (FE) model based on an anisotropic elastoplastic damage model is established to simulate the impact dent of composite laminates subjected to low velocity impact (LVI) by implementing a user-defined subroutine VUMAT in Abaqus/Explicit. To validate the FE model, numerical results are compared with the experimental data in terms of impact dent depth, contact force-time response, and projected delamination shape. The simulation shows that considering tensioncompression asymmetry in the elastoplastic constitutive relation has a significant influence on the prediction of dent depth. Besides, it is found that before the knee point, the formation of the impact dent is mainly related to matrix plasticity and damage; while after the knee point, the significant increase of dent depth is caused by fiber breakage on the impact side. The increase of bending stiffness for thicker laminates can decrease the overall deflection, which leads to less fiber breakage and less visible dent.

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Computational micromechanics of the transverse and shear behavior of unidirectional fiber reinforced polymers including environmental effects

Cited by 190 publications

References 44 publications

A multiscale and multiphysics numerical framework for modelling of hygrothermal ageing in laminated composites

A multiscale and multiphysics numerical framework for modelling of hygrothermal ageing in laminated composites

A multiscale methodology quantifying the sintering temperature‐dependent mechanical properties of oxide matrix composites

Prediction of low‐velocity impact dent for composite laminates based on an anisotropic elastoplastic damage model

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